ITALIC 7.0

Tetramelas geophilus (Sommerf.) Norman

Nytt Mag. Naturvid., 7: 236, 1853. Basionym: Lecidea geophila Flörke ex Sommerf. - Suppl. Fl. Lappon.: 157, 1826.

Synonyms: Buellia geophila (Sommerf.) Lynge; Buellia insignis var. muscorum (Hepp) Körb.; Buellia triphragmia (Nyl.) Arnold non auct.; Diplotomma geophilum (Sommerf.) S.R. Singh & D.D. Awasthi; Lecidea triphragmia Nyl. non auct.

Distribution: N - TAA (Nascimbene & al. 2022), Piem (Isocrono & al. 2004), VA (TSB 29476). C - Abr (Gheza & al. 2021).

Description: Thallus crustose, episubstratic, continuous to granulose-verrucose, white to grey-white, without a distinct prothallus. Cortex with calcium oxalate crystals: medulla white, I-. Apothecia lecideine, black, to 0.3-1.2 mm across, immersed to sessile, with a flat to convex, rarely pruinose disc, and a thin, finally often excluded proper margin. Proper exciple brown-black throughout, with rounded, thin-walled cells, the pigment giving a K+ yellow solution; epithecium brown; hymenium colourless, not inspersed with oil droplets, 70-100 µm high, I+ blue; paraphyses branched in upper part, the apical cell 4-5 µm wide, with a brown cap; hypothecium brown-black. Asci 8-spored, clavate to cylindrical-clavate, the apical dome K/I+ dark blue with a pale, conical-pointed apical cushion (axial mass), the wall I-, but the thin outer gel I+ blue, Bacidia-type. Ascospores 3-septate, dark brown, often curved, narrowly ellipsoid, (20-)24-34(-43) x 6-13 µm, the wall uniformly thick, indistinctly rugulate. Pycnidia rare, black, immersed in thallus. Conidia bacilliform, 4-6 µm long. Photobiont chlorococcoid. Spot tests: thallus K- or K+ indistinctly yellow, C-, but C+ intensely yellow under the dissecting microscope , KC+ yellow to orange-yellow, P-. Chemistry: 6-O-methylarthothelin.

Note: a mainly boreal-montane to arctic-alpine, circumpolar lichen overgrowing terricolous and epilithic mosses on calciferous substrata near and above treeline. A related species, Buellia trifracta J. Steiner, is known from the Alps of Austria.

Growth form: Crustose

Substrata: soil, terricolous mosses, and plant debris

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: rare

Subalpine belt: very rare

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

Dry mediterranean belt: absent

pH of the substrata:

1

2

3

4

5

(info)

Solar irradiation:

1

2

3

4

5

(info)

Aridity:

1

2

3

4

5

(info)

Eutrophication:

1

2

3

4

5

(info)

Poleotolerance:

0

1

2

3

(info)

Altitudinal distribution:

1

2

3

4

5

6

(info)

Predictive model

Herbarium samples

Index Fungorum GBIF

P.L. Nimis CC BY-SA 4.0

TSB 11896

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (11896)
2001/11/22